By comparing the financial data from the three different periods, the study aims to identify any changes or trends that may have occurred in the companies' financial performance following the implementation of GST. This analysis can provide insights into how the implementation of GST has affected businesses in different sectors and can help identify areas where further reforms may be necessary. Overall, this study gives a thorough examination of how the GST has affected the financial results of fifteen Indian corporations. The research intends to offer insights into the short- and long-term effects of GST on firms in various industries by evaluating the data gathered for the pre-GST, post-GST, and present periods. Policymakers, academics, and corporate executives may find the study's conclusions interesting since they offer insightful information on the financial implications of the GST's implementation. A paired t-test can be used to determine if total income before and after the introduction of GST differed significantly. For this test, the null hypothesis (Ho) is that there is no discernible change in total income before and after the introduction of the Goods and Services Tax (GST).